I read that any sin against chastity is a mortal sin. Is this true?
Yes it is, this sin falls under offenses against commandment #6. Any sin that goes against the 10 Commandments is a mortal sin.
Examination of Conscience scroll to Sixth and Ninth.
From the CCC: The Sixth Commandment
First off, for a sin to be mortal, according to the Catechism of the Catholic Church,
1857 For a sin to be mortal, three conditions must together be met: "Mortal sin is sin whose object is grave matter and which is also committed with full knowledge and deliberate consent.
Offenses against chastity
From here, you will have to examine your conscience, and of course, go to confession and speak to the priest about it.
Offenses against chastity
CCC 2351 Lust is disordered desire for or inordinate enjoyment of sexual pleasure. Sexual pleasure is morally disordered when sought for itself, isolated from its procreative and unitive purposes.
CCC 2352 By masturbation is to be understood the deliberate stimulation of the genital organs in order to derive sexual pleasure. “Both the Magisterium of the Church, in the course of a constant tradition, and the moral sense of the faithful have been in no doubt and have firmly maintained that masturbation is an intrinsically and gravely disordered action.” “The deliberate use of the sexual faculty, for whatever reason, outside of marriage is essentially contrary to its purpose.” For here sexual pleasure is sought outside of “the sexual relationship which is demanded by the moral order and in which the total meaning of mutual self-giving and human procreation in the context of true love is achieved.”
To form an equitable judgment about the subjects’ moral responsibility and to guide pastoral action, one must take into account the affective immaturity, force of acquired habit, conditions of anxiety or other psychological or social factors that lessen, if not even reduce to a minimum, moral culpability.
CCC 2353 Fornication is carnal union between an unmarried man and an unmarried woman. It is gravely contrary to the dignity of persons and of human sexuality which is naturally ordered to the good of spouses and the generation and education of children. Moreover, it is a grave scandal when there is corruption of the young.
CCC 2354 Pornography consists in removing real or simulated sexual acts from the intimacy of the partners, in order to display them deliberately to third parties. It offends against chastity because it perverts the conjugal act, the intimate giving of spouses to each other. It does grave injury to the dignity of its participants (actors, vendors, the public), since each one becomes an object of base pleasure and illicit profit for others. It immerses all who are involved in the illusion of a fantasy world. It is a grave offense. Civil authorities should prevent the production and distribution of pornographic materials.
CCC 2355 Prostitution does injury to the dignity of the person who engages in it, reducing the person to an instrument of sexual pleasure. The one who pays sins gravely against himself: he violates the chastity to which his Baptism pledged him and defiles his body, the temple of the Holy Spirit. Prostitution is a social scourge. It usually involves women, but also men, children, and adolescents (The latter two cases involve the added sin of scandal.). While it is always gravely sinful to engage in prostitution, the imputability of the offense can be attenuated by destitution, blackmail, or social pressure.
CCC 2356 Rape is the forcible violation of the sexual intimacy of another person. It does injury to justice and charity. Rape deeply wounds the respect, freedom, and physical and moral integrity to which every person has a right. It causes grave damage that can mark the victim for life. It is always an intrinsically evil act. Graver still is the rape of children committed by parents (incest) or those responsible for the education of the children entrusted to them.
The sexual act is part of the Sacrament of Holy Matrimony, any abuse of this act is therefore sacrilegious. which is a ***serious ***sin.
I can’t say who has committed a MORTAL sin and who has not. I am not at liberty to judge how culpable someone is for any particular sin, or how much they understand what they are doing. But… that doesn’t take away from the seriousness of ANY sexual sin.
:twocents: There are however sins against chastity (sexual self control) that might not constitute grave matter, depending on your intention i.e. not turning your eyes away quickly enough from some scantily clad people at the beach, having an impure thought etc.
Don’t get me wrong, I’m not saying these things are ok to do, because these smaller sins left unchecked are what lead to more serious sins; but I do believe that the statement “any sin against chastity is a mortal sin” is somewhat exaggerated, especially to somone who might suffer from scruples.